Means for transmitting and receiving angular or rotary motions.



R. W. L. PHILLIPS. ME ANS FOR TRANSMITTING AND RECEIVING ANGULAR 0R ROTARY MOTIONS.

APPLICATION FILED JUNE 4.- 1911.

1 ,289,898. Patentesti[21350.83i,T 1918.

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R. W. L. PH|LL|PS. MEANS FOR TRANSMITTING AND RECEIVING ANGULAR OR NOTARY MOTIONS.

APPLICATION FILED JUNE 4.1917.

Patented Dec. 31, 1918.

4 SHEETS-SHEET 2.

R. W. L. PHILLIPS.

MEANS FOR TRANSMITTING AND RECEIVING ANGULAR 0R ROTARY MOTIONS.

APPLICATION FILED JUNE 4. 9'1- 1,289,898. Patented Dec. 31, 1918.

4 SHEET$$HEET 3.

T TTTT R. W.IL. PH|LLIPS.

MEANS FOR TRANSMITTING AND RECEIVING ANGULAR 0R ROTARY MOTIONS.

APPLICATION FILED IUNE 4.1917.

1 ,289,898. I Patented Dec. 31, 1918.

4 SHEETS-SHEET 4.

UNITED sTATEs PATENT 'orrron.

ROBERT WILFRED LUCAS PHILLIPS, OF THE COUNTY OF BEDFORD, ENGLAND.

MEANS FOR TRANSMITTING AND RECEIVING ANGULAR OR ROTARY MOTIONS.

Specification of Letters Patent.

Patented Dec. 31, 1918.

Application filed June 4, 1917. Serial No. 172,770.

To all whom it may concern:

Be it known that I, ROBERT WILFRED LU- oAs PHILLIPS, a subject of the King of England, residing in county of Bedford, England, have invented certain new and useful Improvements in Means for Transmitting and Receiving Angular or Rotary Motions, of which the following is a specification.

This invention relates to means for transmitting and receiving angular or rotary movement, and comprises improved means for effecting this object by electrical apparatus of the type in which at each of the stations between which themovement is to be transmitted similar apparatus is employed which consists essentially of a stationary magnetic system or stator cooperating with a rotatable magnetic system or rotor the angular movement of which at the receiving station is controlled by alternating or pulsating electrical current passed through coils on one of these two cooperating members at both the transmitting and the receiving stations and thereby inducing or tending to induce current in the other 00- operating member; the whole being so arranged that when the two rotors occupy the same angular position in relation to their respective stators the rotating effect of the interaction of the supplied and induced currents in the receiving apparatus is balanced or neutralized, whereas, until the receiving rotor has moved into this neutral posltlon,

the said rotating effect is continually urging it thereto.

Heretofore it has been proposed, in apparatus of this type, to employ concentric ringrotors and rlng-stators each with two or a multiple of two coils, alternating current being supplied to the coils of the stator, which may be either the inner or the outer ring, and the rotor coils being connected in one or more series in closed circuit.

It has also been proposed to employ interconnected three-coil rotors in conjunction with external two-pole stators, the stator coils being supplied with alternating current.

In yet another device the rotor consists of a single coil on a core pivoted between two inturned coil-bearing poles of an external ring-stator. The rotor-coils are connected in series with a sounding device in a closed circuit, and the stator-pole coils are all in series with the leads supplying current.

It will be seen that in all these cases the stator carries the primary or supplied-current coils and the rotor carries only secondary or induced-current coils.

According to the present invention, apparatus of the type described comprises two ring-stators with secondary closed ringwindings interconnected at three or more points of uneven number, and surrounding diametral bar rotors, one to each, one or both of which rotors carry primary coils for the purpose stated.

By the term diametral loar rotor is to be understood a rotor of bar-shape, pivoted like a compass-needle in the middle of the ring-rotor. The bar may consist of a'simple solenoid coil or of sucha coil surrounding 9. (preferably laminated) iron core, while in the case of the instrument at one end of the line, the iron core alone will suffice.

In a preferred construction the ap aratus comprises two similarly wound circu ar elements which will hereinafter be referred to as stators, having the windings interconnected at corresponding points; that is to say tWo or more points on one winding are connected to similarly disposed points on the other winding; another element, hereinafter referred to as a rotor, is mounted concentrically with each stator and may comprise a solenoid winding whereof the magnetic circuit passes through the said'stator-winding;

Other features of the invention will now be described with reference to a particular embodiment thereof illustrated in the accom- Fig. 5 is a sectional elevation of a modi fied construction;

Fig. 6 is a plan of Fig. 5, and Fig. 7 is a diagrammatic representation of the transmitting and receiving devices.

For the sake of clearness, the Winding on the stator hereinafter described has been omitted from all the figures except Fig. 7. Likereference characters indicate like parts in all the figures.

Referring first to Fig. 7, the apparatus comprises two mechanisms A and B which are situated at any desired distance apart. It will be assumed that A is at the transmitting station and B at the receiving station, but it is to be understood that the direction of transmission can be reversed since the two devices are exactly similar.

Each device comprises an iron ring C C provided with a closed ring-winding D D It is important that this winding should be uniformly spaced on the ring. The three points E E E on the winding D, preferably selected at equidistant points, are connected by conductors E to three points F F F on the Winding D these points being selected on the winding D so that they are exactly similarly situated-with respect to one another as are the points E E E At the centers G G of the rings C C there is rotatably mounted an element or rotor H H preferably built up of iron laminations which extend diametrically across the ring. These rotors are each provided with a solenoid winding J J, one end of which is earthed at J J by connection to the iron and the other end of which is connected to a slip-ring J 3 J 7 receiving current through a suitable brush-connection J 4 J An alternating current is supplied from lines K K to each of the solenoid windings J -J One rotor J is connected to the member whose motion is to be reproduced and the other rotor J is connected to the member reproducing such motion.

The operation of the device is as follows The alternating current supply to the winding J creates an alternating magnetic field in the ring C and induces an alternating electromotive force in the winding D. The points E E E of this winding will always have a definite potential difierence from one another depending upon the posi tion of the rotor H.

Exactly the same conditions prevail in the receiving instrument B, and if the two rotors H H occupy the same positions relatively to the interconnected points'of their stator windings, and, are supplied by the same or exactly similar alternating currents, the points E F will, at all times, have the same potential, and similarly the potential at the points E F will be equal and at the points E F. Therefore no current will circulate in the conductors E and the whole system will be in equilibrium. If now the rotor J be displaced angularly the potential at the points E E E will take new values differing from those at the points F F F.

Current will therefore circulate in the 'con-' ductors E and through the two windings D D thereby causing a rearrangement of the magnetic field in the apparatus at B. The rotor J will then move angularly under the influence of the new magnetic conditions t set itself into such a position that equilibrium is restored and no currentflows in the conductors E. This position is one corresponding to that in which the rotor J has been placed. In other words, the rotor J follows or reproduces the movement of the rotor J.

Referring now toFigs. 1l, which show a suitable construction of device, a laminated iron ring constituting the stator is shown at C and the rotor at H. The ring C is secured in a suitable dish-shaped casing L fitted with a cover-plate L secured'thereon by studs L The cover-plate L is itself, in a manner not shown, held rigidly by a supportingbracket or equivalent means, and thus forms an inverted base-plate for the instrument. The casing L'is provided with external stiffening webs L and with a num ber of internal strips L which are ma' chined to receive the core stampings of the stator C. The rotor H is carried on a spindle M rotatable in ball-bearings M in the stator and stator cover L At its lower end the spindle M carries a light casing M which surrounds the whole device and is filled with transformer oil or other suitable insulating medium which insures good insulation and also acts as a damping device. A prolongation downward of the spindle M is also conveniently used for operating an indicating finger or other device for showing or recording movements of the rotor.

The solenoid winding on the rotor is indicated at J, the slip-ring at J and the brush at J*, the brushconnection being brought out to a suitable terminal J on the stator-cover. The spindle M is connected at the transmitting station to the member whose motion is to be reproduced, and at the receiving station to the member reproducing such motion. The spindle M is therefore extended above or below the device according to the particular mechanical construction required.

Figs. 5 and 6 show a modified construction according to this invention in which there are two stators and rotors at each station. The two rotors N N are given a slight angular displacement as shown in Fig. 6, and the two stators C have their interconnection points similarly situated. Instead of using two separate stators C, a single stator of sufficient depth to accommodate the two rotors may be provided.

Owing to the angular displacement of the two rotors N N 2 with respect to one another, they will always take up such a position that they are equally inclined to the neutral position on opposite sides of it. This construction is used to give greater sensitiveness in the neutral or rest position and also to obtain greater power in the operation.

It Was stated above that the lwindingon the stator core should be "uniformly spaced,

in order that the reproduction of the motion of the transmitting rotor should be exact. While this is the preferred construction, it might be required, in some particular instance, to reproduce the motion irregularly, that is to say, the motion might be magnified over a part of the range, or an other modification introduced. Such modifications could be effected by a suitable disposition of the Winding on the stator core.

What I claim as my invention and desire to secure by Letters Patent is 1. In apparatus of the type described, two ring-stators With secondary closed ringwindings interconnected at three or more points of uneven number and surrounding diametral double rotors of the bar type one to each, the bars of each double rotor having a slight angular displacement to each other and being both supplied from the same source ofalternating current, one of the double rotors carrying primary coils for the purpose stated.

2. In apparatus of the type described, two ring-stators with secondary closed ringwindings interconnected at three or more points of uneven number and surrounding diametral double rotors of the bar type one to each, the bars of each double rotor having a slight angular displacement to each other and being both supplied from the same source of alternating current, both of the double rotors carrying primary coils for the v purpose stated.

In testimony whereof I have signed my name to this specification.

ROBERT WILFRED LUCAS PHILLIPS.- 

